package com.atguigu.eduservice.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.atguigu.config.exceptionhandler.GuliException;
import com.atguigu.eduservice.entity.EduSubject;
import com.atguigu.eduservice.entity.excel.SubjectData;
import com.atguigu.eduservice.service.EduSubjectService;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;

/**
 * SubjectExcelListener不能交给Spring管理，需要自己new，不能注入其他对象
 * 不能实现数据库操作 ==> 传入对象参数
 */
public class SubjectExcelListener extends AnalysisEventListener<SubjectData> {


    public EduSubjectService subjectService;


    public SubjectExcelListener() {
    }

    public SubjectExcelListener(EduSubjectService subjectService) {
        this.subjectService = subjectService;
    }

    //
    @Override
    public void invoke(SubjectData subjectData, AnalysisContext analysisContext) {
        if(subjectData == null) {
            throw new GuliException(20001,"文件数据为空");
        }

        //添加一级分类
        EduSubject existOneSubject = this.existOneSubject(subjectService,subjectData.getOneSubjectName());

        if(existOneSubject == null) {//没有相同的,设置一级分类名称
            existOneSubject = new EduSubject();
            existOneSubject.setParentId("0");
            existOneSubject.setTitle(subjectData.getOneSubjectName());
            subjectService.save(existOneSubject);
        }



        //获取一级分类id值
        String pid = existOneSubject.getId();

        //添加二级分类
        EduSubject existTwoSubject = this.existTwoSubject(subjectService,subjectData.getTwoSubjectName(), pid);

        if(existTwoSubject == null) {
            existTwoSubject = new EduSubject();
            existTwoSubject.setTitle(subjectData.getTwoSubjectName());
            existTwoSubject.setParentId(pid);
            subjectService.save(existTwoSubject);
        }

    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {

    }



    //判断一级分类是否重复
    private EduSubject existOneSubject(EduSubjectService subjectService,String name) {
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id","0");
        EduSubject oneSubject = subjectService.getOne(wrapper);
        return oneSubject;
    }
    //判断二级分类是否重复
    private EduSubject existTwoSubject(EduSubjectService subjectService,String name,String pid) {
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id",pid);
        EduSubject twoSubject = subjectService.getOne(wrapper);
        return twoSubject;
    }

}
